How to modify file association in Ubuntu 12.04

Ubuntu 12.04 File Association modification method sudo gedit/usr/share/applications/mimeinfo. the. for example, if you change the default video Association to mplayer, you can press ctrl + h and replace totem with gnome-mplayer www.2cto.com. You can search for the meaning of each English word in the new version, then read the comments. If mimeinfo. there are too many associations in the cache. You can directly modify the ults. list, here the association is rhythmbox, totem, libre several, it is easy to change, and then replace mimeinfo. content in the cache. You can specify a few links when opening them, but if there are too many links, for example, if you want to use an image viewer to browse images, the result is associated with GIMP or WINE by default, then, the image Viewer is not even in the right-click menu. If you need to find the image by yourself, it will be very painful to modify it slowly.